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Hi, I'm Looking to buy a used set of cd,s called Understanding Manual D - Air Flow and Duct Design In The Real World. Any help would be much appreciated, thank you in advance!

steve

The disks are done by Jack Rise, they are very good at explaining step by step how to fill out the friction rate worksheet and how to select the proper size ducts as per Manual D.
The first RSES class I ever took around 1986 was taught by Jack, he is a very good presenter.